Mbh 3.116.1a

“Akritavrana said, ‘Jamadagni devoted himself to the study of the Veda and the practice of sacred penances, and became famous for his great austerities. Then he pursued a methodical course of study and obtained a mastery over the entire Veda. And, O king, he paid a visit to Prasenajit and solicited the hand of Renuka in marriage. And this prayer was granted by the king. And the delight of Bhrigu’s race having thus obtained Renuka for his wife, took his residence with her in a hermitage, and began to practice penances, being assisted by her. And four boys were born of her, with Rama for the fifth. And although the youngest, Rama was superior to all in merit. Now once upon a time, when her sons had gone out for the purpose of gathering fruits, Renuka who had a pure and austere life, went out to bathe. And, O king, while returning home, she happened to cast her glance towards the king of Martikavata, known by the name of Chitraratha. The king was in the water with his wives, and wearing on his breast a lotus wreath, was engaged in sport. And beholding his magnificent form, Renuka was inspired with desire. And this unlawful desire she could not control, but became polluted within the water, and came back to the hermitage frightened at heart. Her husband readily perceived what state she was in. And mighty and powerful and of a wrathful turn of mind, when he beheld that she had been giddy and that the lustre of chastity had abandoned her, he reproached her by crying out ‘Fie!’ At that very moment came in the eldest of Jamadagni’s sons, Rumanvan; and then, Sushena, and then, Vasu, and likewise, Viswavasu. And the mighty saint directed them all one by one to put an end to the life of their mother. They, however, were quite confounded and lost heart. And they could not utter a single word. Then he in ire cursed them. And on being cursed they lost their sense and suddenly became like inanimate objects, and comparable in conduct to beasts and birds.